You have to know HSRP inside and outside to pass the BCMSN test to get your CCNP certification. While HSRP’s function and basic commands are very easy, such essential information are easy to disregard, but are crucial if HSRP is to operate as you wish. Let’s look at using both the examination and the output networks with the priority command proper.

Priority is a key value in the standby display command. The norm is 100, and the main HSRP router is the router with the highest priority. We will increase the priority on R2 by default and see the outcomes. R3 is the active router actually and R2 is standby, so let’s prioritize R2 and see what happens.

R2(config)#interface ethernet0

R2(config-if)#standby 5 priority 150

R2#show standby

Ethernet0 – Group 5

Local state is Standby, priority 150

Hellotime 4 sec, holdtime 12 sec

Next hello sent in 0.896

Virtual IP address is 172.12.23.10 configured

Active router is 172.12.23.3, priority 100 expires in 8.072

Standby router is local

1 state changes, last state change 00:14:24

R2 now has a higher priority, but R3 is still the active router. R2 will not take over as the HSRP primary until R3 goes down – OR the preempt option is configured on R2.

R2(config-if)#standby 5 priority 150 preempt

1d11h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 state Standby -> Active

R2#show standby

Ethernet0 – Group 5

Local state is Active, priority 150, may preempt

Hellotime 4 sec, holdtime 12 sec

Next hello sent in 1.844

Virtual IP address is 172.12.23.10 configured

Active router is local

Standby router is 172.12.23.3 expires in 10.204

Virtual mac address is 0000.0c07.ac05

2 state changes, last state change 00:00:13

A alert arrives after only a few seconds that the local state is switched from standby to operational. Show standby reveals that the working router – the main one – is now R2, the nearby router. R3’s standby today. If you’ve been told that you have to take a router to adjust the Active router, it is incorrect. On the default priority command, you just have to use a preempt choice.

Another important aspect of HSRP setups is how the virtual router’s MAC address and interface monitoring change. In the next section of my HSRP tutorial, we will see these functions!

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